Author Topic: Pacific Vapor Engine from Morrison & Marvin Castings  (Read 175522 times)

Offline kvom

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Re: Pacific Vapor Engine from Morrison & Marvin Castings
« Reply #645 on: September 26, 2018, 02:34:26 AM »
We need a Merlin build here.

Offline Dave Otto

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Re: Pacific Vapor Engine from Morrison & Marvin Castings
« Reply #646 on: December 14, 2018, 11:20:22 PM »
Hi guys
When I first built the drive gear assembly for the pump there were quite a few comments about how the gear covered up the nice lettering on the base of the engine. I really wanted to stay true to that advertisement that I had used to model the pump assembly.

Well after looking at it for a while now and watching it run I have decided to go ahead a put some spokes in the cast iron bull gear. I feel that it will give the engine more visual interest both running and static. Being able to see the Pacific logo will also be a plus.

Some of the early California engine builders used webs between the flywheel spokes for counter weights. Mery is one that comes to mind. I decided that the web approach would be a good way to create the boss where the drive pin will be located.


The gear was modeled in Alibre to see how it would look. I printed one at work so I could put it on the engine and think about it for a while. I kind of liked it.


Starting out a pair of soft jaws were machined to hold the gear.


Then the gear was indicated in.


The first side of the gear is machined. I used a .03 radius carbide bull mill for all operations. This way I could use this cutter to surface the radius in and not have to change tools. A, (Z Level finish) tool path was used with a .005Ē step down. Iím a long time user of BobCAD and really liking the current version #31, I believe it is their best yet.


The gear was flipped over indicated in, and machined.


Here it is fresh from the mill to see how it is going to look.


After a little bench work to remove the tool marks and a light bead blast. Iím quite pleased with how it looks on the engine.
One other concern I had was how to keep that large machined solid gear looking nice, now it can be painted with just the outer rim left bare.


Thanks for checking in.
Dave

Offline Art K

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Re: Pacific Vapor Engine from Morrison & Marvin Castings
« Reply #647 on: December 14, 2018, 11:37:51 PM »
Dave,
The job on the gear is great. Looks good on the engine as well. I have to admit not owning any bull endmill. Standard and a few radius emill's.
Art
"The beautiful thing about learning is that no one can take it away from you" B.B. King

Offline cnr6400

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Re: Pacific Vapor Engine from Morrison & Marvin Castings
« Reply #648 on: December 14, 2018, 11:47:09 PM »
That last photo is great Dave, and fine work on the gear and other engine and pump parts. Staying tuned here!  :popcorn:

Offline kvom

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Re: Pacific Vapor Engine from Morrison & Marvin Castings
« Reply #649 on: December 14, 2018, 11:59:43 PM »
I see a few chips in a couple of the photos.  Dave's work is slipping.   :stir:

Gear is great anyway.

Offline Steamer5

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Re: Pacific Vapor Engine from Morrison & Marvin Castings
« Reply #650 on: December 15, 2018, 12:10:43 AM »
Hi Dave,
 Just been back to check the before shot!
This steps it up yet another level! Very very nice.

Cheers Kerrin
Get excited and make something!

Offline fumopuc

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Re: Pacific Vapor Engine from Morrison & Marvin Castings
« Reply #651 on: December 15, 2018, 04:32:18 AM »
Hi Dave, very impressive. Ist there any picture of the operation itself available, with the cutter ?
Kind Regards
Achim

Online Kim

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Re: Pacific Vapor Engine from Morrison & Marvin Castings
« Reply #652 on: December 15, 2018, 06:44:47 AM »
Wow Dave! That looks amazing!  Very slick indeed.
So, I'm not familiar with the term Bull Mill.  What's different about a bull mill compared to a regular end mill?
Kim

Online Jasonb

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Re: Pacific Vapor Engine from Morrison & Marvin Castings
« Reply #653 on: December 15, 2018, 07:11:44 AM »
Sounds like what we call a radius end mill, just the corners of the tips have a convex radiused, I have freehand ground them from blunt standard cutters when wanting an internal fillet as they remove metal far faster than a round nose (which we call bull nose) cutter.

Wheel looks good Dave

Offline yogi

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Re: Pacific Vapor Engine from Morrison & Marvin Castings
« Reply #654 on: December 15, 2018, 02:14:35 PM »
Beautiful gear Dave!  :ThumbsUp: :ThumbsUp: :ThumbsUp:
It adds even more character to an already impressive masterpiece!  :popcorn:

Offline Tennessee Whiskey

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Re: Pacific Vapor Engine from Morrison & Marvin Castings
« Reply #655 on: December 15, 2018, 04:01:17 PM »
Beauty on top of beauty  :ThumbsUp: :ThumbsUp: 

Eric

Offline Ye-Ole Steam Dude

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Re: Pacific Vapor Engine from Morrison & Marvin Castings
« Reply #656 on: December 15, 2018, 04:01:29 PM »
Hello Dave,

OK, that gear is way too pretty to cover up any part of it with paint, how about anodize it?  :praise2:

Have a great day,
Thomas

Offline zeeprogrammer

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Re: Pacific Vapor Engine from Morrison & Marvin Castings
« Reply #657 on: December 15, 2018, 05:52:24 PM »
Your finishes are always astounding.
I'd like to know more about your bead blasting system and other tips/techniques for getting those awesome finishes.

P.S. Chips on the table? tsk tsk
Carl (aka Zee) Will sometimes respond to 'hey' but never 'hey you'.
"To work. To work."
Zee-Another Thread Trasher.

Offline Dave Otto

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Re: Pacific Vapor Engine from Morrison & Marvin Castings
« Reply #658 on: December 16, 2018, 05:10:48 PM »
Thanks for all the very nice comments guys.

Yesterday was a busy day for us, my daughter graduated from BSU with her degree in Mechanical Engineering, her mom and I are very proud of her. She already has a great job at a local robotic and industrial automation company where she has worked for the last couple of years first as a summer intern and then an engineer in training. https://thehouseofdesign.com/

As Jason has indicated a bull end is just a different name for a flat end mill with radiused corners. Lots of times it is nice to have both the flat cutting ability and the radius combined in one tool. They are very nice for 3d surfacing in some applications.

Achim, I didnít take any pictures of the cutting operation but I have attached a picture of the tool path used to radius the spokes. Because of the radius on the tool the steps are blended and only take a quick rub with some sanding cloth to remove the tool marks.

Zee, I have also attached a picture of my little blast cabinet. Itís nothing very fancy, I built it many years ago. The upper box with the arm holes I purchased at an employee auction. It was a small self contained bench top unit for doing very fine cleaning of vacuum system components; all I got was the sheet metal box. I fabricated stand and lower hopper and assembled what you see here. A small gun was purchased and I had scrounged a foot pedal air valve. The fancy stainless steel cyclone separator was added later down the road. It came off a piece of high tech equipment that a friend was scrapping out.

But what matters is the media, I use very fine glass bead (https://www.mcmaster.com/3337k59) to obtain that nice satin look. The prep work is done with fine files, sanding sticks and sanding cloth rolls.

Thanks again guys, I will try to do a better job of the swarf-less machining that I seem to be known for. :Lol:

Dave

Offline fumopuc

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Re: Pacific Vapor Engine from Morrison & Marvin Castings
« Reply #659 on: December 16, 2018, 06:25:46 PM »
Hi Dave, thanks for the toolpath picture, it makes it easier for me to understand.
Kind Regards
Achim